{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8477409","patent":{"patent_number":"US-8477409","title":"PLC-type delay demodulation circuit and PLC-type optical interferometer","assignee":null,"inventors":[],"filing_date":"2012-09-13T00:00:00.000Z","publication_date":"2013-07-02T00:00:00.000Z","cpc_codes":["G02F","H04B","G02F"],"num_claims":16,"abstract":"Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output waveguides. In a PLC-type delay demodulation circuit, arm waveguides of a first MZI and arm waveguides of a second MZI are formed so as to overlap each other in the same region of a planar lightwave circuit. The optical paths of the MZIs are arranged such that the propagation directions of two DQPSK signals branched by a Y-branch waveguide are opposite to each other."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"PLC-type delay demodulation circuit and PLC-type optical interferometer","description":"Disclosed are a PLC-type delay demodulation circuit and a PLC-type optical interferometer capable of reducing the size of a PLC chip with respect to the arrangement of various kinds of light output wa","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8477409","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8477409","citation_suggestion":"Patentable. \"PLC-type delay demodulation circuit and PLC-type optical interferometer\" (US-8477409). https://patentable.app/patents/US-8477409","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8477409","json":"https://patentable.app/api/llm-context/US-8477409","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T01:55:06.294Z"}